class producer {

   public:
      producer(mutex m, condition_variable cv)
      {
           mut = m;    // ERROR
           cvar = cv;   // ERROR
       }

    private:
         mutex mut;
         condition_variable cvar;
}

int main ()
{
    mutex m;
    condition_variable cv;
    //Initialize mutex & cv
    producer prod(m, cv);
}